if the nth term of an A.P. is (2n+1), find the sum of the first n terms of the A.p.
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The formula of Sum is n/2(a+l)
So the sum of first n terms is n/2(3+2n+1)
The sum of first n terms is n^2 + 2n
So the sum of first n terms is n/2(3+2n+1)
The sum of first n terms is n^2 + 2n
Anonymous:
Can u explain plz?
First of you must know the formula of Sum of n terms
The data is given
nth term of a.p is 2n+1, Then the series will be 3,5,7,9,11,13.....
Then there are two formulas to find sum first one is Sn= n/2{2a+(n-1)d} and other one is n/2{a+l} (l means last term) now put the data and get sum
pls mark it as brainliest
Thanks
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